Wideband inversion method for bulk medium

Abstract

The invention discloses a wideband inversion method for a bulk medium, and the method comprises the following steps of extracting frequency extension of actual wavelets for compressive sensing according to the frequency band of seismic data; establishing a convolution model of earthquakes by using the compressive sensing theory, performing frequency extension by using the compressive sensing theory to obtain full-band reflection coefficients in the seismic signal, and calculating the seismic full-band reflection coefficients using a fast threshold iterative method; calculating a seismic channel integral by summing up the integration of the seismic reflection coefficients to convert the seismic data into a seismic relative impedance profile, and subjecting the reflection coefficients of low-frequency extension to odd multiple integrations by using the multiple integration technology to obtain relative impedance bodies of different main frequencies; scanning the main frequencies of the odd multiple integrations, and scanning the relative amplitude relationship of the log impedance spectrums at the main frequencies of the integrated profiles at the same time; calculating the weightingcoefficients of the odd multiple integrations by using the relative amplitude relationship of the log impedance at different main frequencies, and reconstructing a seismic relative impedance invertomer by using a weighted addition method.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a broadband inversion method for block media. Background technique [0002] Restricted by the current acquisition and processing technology and control of seismic data, the frequency range of seismic data is generally limited to a few to tens of Hz. At present, there are many researches on compensation methods for high-frequency components, but less research on low-frequency protection and compensation. Geophysicists have noticed that the low-frequency information in seismic data is very meaningful. Since low-frequency signals travel much farther than high-frequency signals, the content they carry is richer. With the development of shallow oil, it is necessary to carry out deep exploration, and low-frequency information highlights its importance. Especially for the emerging full waveform inversion, the frequency content below 10Hz also has a very important position. If yo...

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Problems solved by technology

[0004] However, there are some problems in the above-mentioned seismic wave impedance inversion: the contour of the reservoir boundary is easily destroyed by interpolation modeling, and the inversion results of the seismic-based inversion method are affected by the model at low frequencies, and the boundary is blurred, making it difficult to determine the effective range of the reservoir

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